Regeneration of carbon nanotube and nanofibre composite film electrode for electrical removal of cupric ions

2010 ◽  
Vol 61 (6) ◽  
pp. 1427-1432 ◽  
Author(s):  
Yankun Zhan ◽  
Haibo Li ◽  
Likun Pan ◽  
Yanping Zhang ◽  
Yiwei Chen ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Composite Film ◽  
Electrode Surface ◽  
Large Scale ◽  
Low Cost ◽  
Short Circuit ◽  
Composite Films ◽  
Film Electrode ◽  
Reverse Voltage ◽  
Regeneration Efficiency

Low cost and large scale carbon nanotube and nanofibre (CNT–CNF) composite films have been fabricated and employed as electrodes for electrosorption of cupric ions. The regeneration of the saturated CNT–CNF film electrode has been investigated. Three methods (short-circuiting, short-circuiting and then reversing voltage, reversing voltage and then short-circuiting) are used for regeneration. The results show that low regeneration efficiency of CNT–CNF film electrode due to electrodeposition of Cu on the electrode surface can be highly improved by regeneration applying reverse voltage combined with short circuit. 93% regeneration efficiency can be achieved when 0.8 V reverse voltage is applied before short-circuiting during regeneration of CNT–CNF film electrode.

scholarly journals Mechanical and Electroconductive Properties of Mono- and Bilayer Graphene–Carbon Nanotube Films

Coatings ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 74 ◽  
Author(s):  
Michael Slepchenkov ◽  
Olga Glukhova
Keyword(s):  
Carbon Nanotube ◽  
Composite Film ◽  
Electrical Resistance ◽  
Composite Films ◽  
Bilayer Film ◽  
Vertical Force ◽  
Covalent Bonds ◽  
Local Stresses ◽  
Axial Stretching ◽  
Tube Distance

This article presents the results of a computer study of electrical conductivity and deformation behavior of new graphene–carbon nanotube (CNT) composite films under bending and stretching. Mono- and bilayer hybrid structures with CNTs (10,0) and (12,0) and an inter-tube distance of 10 and 12 hexagons were considered. It is revealed that elastic deformation is characteristic for mono- and bilayer composite films both in bending and stretching. It is found that, in the case of bending in a direction perpendicular to CNTs, the composite film takes the form of an arc, and, in the case of bending in a direction along CNTs, the composite film exhibits behavior that is characteristic of a beam subjected to bending deformation as a result of exposure to vertical force at its free end. It is shown that mono- and bilayer composite films are more resistant to axial stretching in the direction perpendicular to CNTs. The bilayer composite films with an inter-tube distance of 12 hexagons demonstrate the greatest resistance to stretching in a direction perpendicular to CNTs. It is established that the CNT diameter and the inter-tube distance significantly affect the strength limits of composite films under axial stretching in a direction along CNTs. The composite films with CNT (10,0) and an inter-tube distance of 12 hexagons exhibit the highest resistance to stretching in a direction along CNTs. The calculated distribution of local stresses of the atomic network of deformed mono- and bilayer composite films showed that the maximum stresses fall on atoms forming covalent bonds between graphene and CNT, regardless of the CNT diameter and inter-tube distance. The destruction of covalent bonds occurs at the stress of ~1.8 GPa. It is revealed that the electrical resistance of mono- and bilayer composite films decreases with increasing bending. At the same time, the electrical resistance of a bilayer film is 1.5–2 times less than that of a monolayer film. The lowest electrical resistance is observed for composite films with a CNT (12,0) of metallic conductivity.

scholarly journals A Comparative Study of BaTiO3/PDMS Composite Film and a PVDF Nanofiber Mat for Application to Flexible Pressure Sensors

2021 ◽  
Vol 59 (6) ◽  
pp. 412-421
Author(s):  
Donghyuck Park ◽  
Kwanlae Kim
Keyword(s):  
Comparative Study ◽  
Composite Film ◽  
Short Circuit ◽  
Composite Films ◽  
Pressure Sensors ◽  
Compressive Force ◽  
Short Circuit Current ◽  
Open Circuit ◽  
Force Range ◽  
Flexible Pressure Sensors

A Comparative Study of BaTiO3/PDMS Composite Film and a PVDF Nanofiber Mat for Application to Flexible Pressure SensorsIntensive research has been conducted to develop flexible piezoelectric pressure sensors, since selfpowering devices are advantageous for wearable electronic applications. Recently, two types of piezoelectric devices, ceramic-PDMS composite film and PVDF nanofiber mats, have drawn attention in the research community. Piezoelectric ceramics such as BaTiO3 (BTO) and PZT exhibit outstanding piezoelectric coefficients, while PDMS provides flexibility. In contrast, a PVDF nanofiber mat simultaneously exhibits piezoelectricity and flexibility. In the present study, a comparative analysis of BTO-PDMS composite film and a PVDF nanofiber mat for application to flexible pressure sensors was carried out. First, step-wise electric poling was conducted on these two types of pressure sensors, after which the open-circuit voltage (Voc) was measured under compressive force. The 1.8 V peak-to-peak Voc was measured in a BTO-PDMS composite with a 30 wt.% BTO content that was poled by 10 kV/mm electric field for 15 min. This peak-to-peak Voc of the BTO-PDMS composite increased further to ~ 4 V when it was poled for 24 hr. Unlike the BTO-PDMS composite films, the maximum Voc (1.1 V) was measured in a PVDF nanofiber mat that did not undergo subsequent electric poling. A BTO-PDMS composite film and a PVDF nanofiber mat were fabricated, and the compressive force and strain-rate dependencies of Voc and the short-circuit current (Isc) were investigated. Overall, the Voc and Isc of the BTO-PDMS composite film exceeded those of the PVDF nanofiber mat in a force range of 1 − 25 N and frequency range of 0.5 − 2.0 Hz. However, the Voc and Isc signals from the PVDF nanofiber mat were more stable than those from the BTO-PDMS composite film due to the longer lifetime of the signals.

Facile fabrication of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)-coated selenium nanowire/carbon nanotube composite films for flexible thermoelectric applications

2021 ◽  
Author(s):  
Dabin Park ◽  
Minsu Kim ◽  
Jooheon Kim
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Composite Film ◽  
Composite Films ◽  
Multi Walled Carbon Nanotubes ◽  
Facile Fabrication ◽  
Selenium Nanowires ◽  
Carbon Nanotube Composite ◽  
Flexible Thermoelectric ◽  
Walled Carbon Nanotubes

In this study, we synthesized a flexible thermoelectric composite film consisting of poly(3,4-ethylenedioxythiopene)-poly(4-styrenesulfonate)-coated selenium nanowires (PEDOT:PSS-coated Se NWs) and multi-walled carbon nanotubes (MWCNT) via simple solution mixing. The PEDOT:PSS-coated Se...

scholarly journals Functionalized Multiwalled Carbon Nanotube-Reinforced Polyimide Composite Films with Enhanced Mechanical and Thermal Properties

2019 ◽  
Vol 2019 ◽  
pp. 1-12 ◽  
Author(s):  
Min Chao ◽  
Yanming Li ◽  
Guanglei Wu ◽  
Zhenjun Zhou ◽  
Luke Yan
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotube ◽  
Composite Film ◽  
Composite Films ◽  
Conductive Filler ◽  
Filler Loading ◽  
Multiwalled Carbon Nanotube ◽  
High Thermal Conductivity ◽  
Mechanical And Thermal Properties ◽  
Multiwalled Carbon

Polyimide- (PI-) based nanocomposites containing the 4,4′-diaminodiphenyl ether- (ODA-) modified multiwalled carbon nanotube (MWCNT) filler were successfully prepared. The PI/MWCNTs-ODA composite films exhibit high thermal conductivity and excellent mechanical property. The optimal value of thermal conductivity of the PI/MWCNTs-ODA composite film is 0.4397 W/mK with 3 wt.% filler loading, increased by 221.89% in comparison with that of the pure PI film. In addition, the tensile strength of the PI/MWCNTs-ODA composite film is 141.48 MPa with 3 wt.% filler loading, increased by 20.74% in comparison with that of the pure PI film. This work develops a new strategy to achieve a good balance between the high thermal conductivity and excellent mechanical properties of polyimide composite films by using functionalized carbon nanotubes as an effective thermal conductive filler.

On the Development of Fluidized Bed Chemical Vapour Deposition for Large-Scale Carbon Nanotube Synthesis: Influence of Synthesis Temperature

2007 ◽  
Vol 60 (7) ◽  
pp. 541 ◽  
Author(s):  
Chee Howe See ◽  
Andrew T. Harris
Keyword(s):  
Carbon Nanotube ◽  
Fluidized Bed ◽  
Chemical Vapour Deposition ◽  
Large Scale ◽  
Vapour Deposition ◽  
Low Cost ◽  
Chemical Vapour ◽  
Nickel Catalysts ◽  
Synthesis Temperature ◽  
Carbon Nanotube Synthesis

The absence of large-scale carbon nanotube synthesis technology (which we define as being of the order of 10 000 tonnes per plant per year) is limiting research and development activities across the sector. We contend that fluidized bed chemical vapour deposition (FBCVD) is the most promising technology for large-scale, low-cost, carbon nanotube synthesis. In this work, multi-walled carbon nanotubes were synthesized on alumina-supported iron, cobalt, or nickel catalysts by catalytic chemical vapour deposition in a 0.5 kg h–1 FBCVD reactor, using ethylene as a carbon source. The carbon nanotube yield was shown to increase with an increase in synthesis temperature from 3.3% at 550°C to 87.6% at 900°C. At higher synthesis temperatures the quality of the nanotubes appeared to improve, although further experiments are required to quantify this within statistically significant limits.

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